Short answer
Yellowing leaves on a Pilea peperomioides are most frequently caused by improper watering, specifically root stress from overly saturated soil. The most common and effective fix is to ensure your pot has adequate drainage and to strictly wait until the top inch of soil is dry before watering again.
Yellowing leaves, or chlorosis, on a Chinese Money Plant often start with the lower, older foliage turning pale or yellow before eventually dropping. While it is rarely an immediate death sentence, it is a significant signal that your plant's environment—usually its hydration or soil health—is currently out of balance.
Pilea peperomioides are prone to root rot if they sit in damp soil for extended periods. When the root system can no longer absorb nutrients efficiently due to suffocation, the lower leaves will yellow and become soft or mushy.
Check: Check the soil at least two inches down; if it feels constantly wet or swampy, the roots are likely stressed.
Fix: Cease watering immediately, ensure the pot has drainage holes, and trim away any black, mushy roots before repotting into fresh, well-draining soil.
It is perfectly normal for the oldest, lowest leaves on a mature Pilea to yellow and fall off as the plant focuses its energy on new growth at the crown. This is a natural part of the plant's life cycle and should not be a cause for concern if the rest of the plant looks vigorous.
Check: Ensure the yellowing is restricted to only the lowest, oldest leaves and that the rest of the plant is healthy and growing new leaves.
Fix: No fix is required; simply prune off the yellow leaf once it has completely withered.
While Pilea are not heavy feeders, they can develop yellowing leaves if grown in the same potting medium for several years without fertilization. A lack of nitrogen or iron, or a soil pH that is too high, can prevent the plant from taking up essential nutrients.
Check: Check if the plant has been in the same container for more than two years without being fertilized or repotted.
When to worry
If yellowing spreads rapidly to the newer, upper leaves or if the stems begin to turn brown and mushy at the base, the plant may be experiencing advanced root rot that requires immediate intervention.
Not sure which cause it is?
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Diagnose my Chinese Money PlantYou can leave them until they are mostly yellow or brown, as the plant may still be reabsorbing some nutrients from them. Once they are unsightly or detach with a gentle tug, remove them to keep the plant looking tidy.
While usually bright light is best, intense direct sun can cause 'sunscald,' which appears as bleached or crispy yellow patches on leaves rather than general yellowing. Move your plant slightly further away from the window if you notice these scorched spots.
While viruses like Strawberry Mild Yellow Edge Virus exist, they are extremely rare in home Pilea collections and usually involve specific patterns like vein netting. Most yellowing in Pilea is almost certainly cultural, caused by water or light issues.
Consistent with guidance from: Royal Horticultural Society, University of Minnesota Extension Houseplant Care.
Fix: Apply a balanced liquid houseplant fertilizer diluted to half-strength during the growing season, or repot the plant into fresh indoor potting mix.